Hello Fouquet,

Thank you for reaching out to us.

Please provide me a temporary WP-admin (administrator) user for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. 

We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course, we do not provide login data to third parties. 

You can write credentials here just check PRIVATE Reply so nobody can see them except us.

Hello,

Thank you for the admin credentials.

If you want to add more customers to a booking from the back-end, you can simply click to edit the appointment, and then add more customers.

Hope this helps you.

Please reach out to us if you have any other questions.

Hi there.

It seems you misunderstood what Uros was trying to tell you.

You cannot create a new appointment on top of an existing appointment in the back-end. This is why you cannot create a new appointment and select the date and the time of an appointment that still has places left.

You need to edit the appointment you want to add a customer to, then in the "Customers" section, add another customer. So, you're not creating a new appointment, but editing an existing one and adding a customer to it.

The customers don't have any insight into the back-end or the logic of the plugin, so as far as they're concerned, they're booking a new appointment. However, in reality, they are only adding themselves to an existing appointment, which is what you need to do in order to book a new customer at the same time and on the same day.